Topic: Nonlinear Acousto-ultrasonics-based Characterization of Hypervelocity Impact-induced Damage and Application to Health Monitoring of Space Structures
Speaker: Prof. Su Zhongqing, The Hong Kong Polytechnic University (PolyU)
Time: Wednesday, September 21, 2022, 9:30 - 10:45 am
Live Streaming Platform: Tencent Meeting
Conference ID: 720-851-085
A guided-wave-based structural health monitoring approach for characterizing hypervelocity impact (HVI)-induced damage in a two-layer shielding structure was developed. Aluminum spheres were discharged using a two-stage light gas gun, at an impact speed of ~2.5 km/s and ~4 km/s, respectively, to introduce HVI to the outer shielding layer. The generated acoustic emission signals were acquired with a sparse sensor network consisting of lead zirconate titanate sensor wafers. A nonlinear acousto-ultrasonics-based damage detection algorithm was proposed, to evaluate the damage on the inner layer committed by the debris cloud when the projectile penetrating the outer layer. Combing the ease in implementation of the linear approach and the high sensitivity of the ultrasonic nonlinearity to small damage, the proposed approach offers a solution to the online and in-situ perception and monitoring of HVI-induced damage to orbiting space vehicles.
About the Speaker:
Prof. Su Zhongqing’s research interests include ultrasonics, structural health monitoring (SHM), wave propagation, sensors, non-destructive evaluation, smart materials and advanced composites. He is the current Editor-in-Chief of journal Ultrasonics. Besides, Prof. Su is/was Associate Editor of nine key international journals in his field, including Journal of Sound and Vibration, Structural Health Monitoring: An International Journal, Structural Engineering and Mechanics, ASME Journal of NDE, etc. He is the author/co-author of 2 research monographs, 6 book chapters, 8 edited books/international conference proceedings, and over 330 academic journal articles and international conference papers.
Prof. Su received Structural Health Monitoring - Person of The Year (SHM-POY) Award in 2012, Dragon-Star Innovation Award (1st Place) in 2015 from European Commission, and the Natural Science Award for Higher Education Outstanding Scientific Research Output in 2015 and 2020 respectively, from Ministry of Education China. In PolyU, he was a recipient of the President’s Award for Excellent Performance/Achievement in Research & Scholarly Activities in 2011, Faculty Merit Award in Teaching in 2010, Faculty Award for Outstanding Performance in Research in 2011, and Faculty of Engineering Research Grant Achievement Award in 2014, 2017 and 2020.
School of Reliability and Systems Engineering